Agnes Martin (1912-2004)
Canadian-American artist, often described as Minimalist, considered herself an Abstract Expressionist
https://www.guggenheim.org/artwork/artist/agnes-martin

Happy Holiday / 1999 / Acrylic paint and graphite on canvas / 60”x60”x1.5”

Méret Oppenheim (1913-1985)
German-born Swiss artist produced sculptures, paintings, photographs, drawings, and assemblages
https://nmwa.org/explore/artist-profiles/meret-oppenheim

Wolke auf einem Schiff (Cloud on a Boat) / 1963 / Plaster and paint / 14 9/16”x13”x4 3/4”